Cretaceous
Ankylosaurus
Ankylosaurus magniventris
The catalogue presents Ankylosaurus as a herbivore member of Ankylosauridae that lived during the Cretaceous, between 68.0–66.0 Ma. Its estimated range is 6.25–8.0 m in length and 4.8–8.0 t in mass, giving a practical sense of scale. Reference material comes from Hell Creek Formation, Montana, USA. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Ankylosaurus, the PBDB records the taxonomic attribution as Brown (1908).
The PBDB places it in Ankylosaurinae, and the catalogue record assigns it to the family Ankylosauridae.
- PBDB · taxon.parent
- Ankylosauridae
In the PBDB record, the reported stratigraphic range runs from the Campanian to the Maastrichtian.
The PBDB catalogues 15 occurrences, with material from the Ferris Formation (5), from the Hell Creek Formation (4) and from the Lance Formation (3). Provenance: United States and Canada.
The catalogue records the holotype as AMNH 5895 and the type locality as “Hell Creek Formation, Montana, USA”.
- AMNH 5895
- Hell Creek Formation, Montana, USA
The catalogue's reference measurements are 6.25–8.0 m in length and 4.8–8.0 t in mass — estimates, which vary with specimen and method.
- 6.25-8.0 m
- 4.8-8.0 tons
The record gathers 71 bibliographic references registered in the PBDB, listed below.
Where it lived
Fossil occurrences on today’s map and in the tectonic reconstruction.
Positions reconstructed by PBDB/GPlates, not observed; this is not an exact habitat map.
Artistic 3D reconstruction
There is no approved species-specific 3D model yet. Generic anatomy will not be presented as if it were evidence.
Physical Specifications
- Length
- 6.25–8.0 m
- Weight
- 4.8–8.0 t
- Period
- Cretaceous
- Time range
- 68.0–66.0 Ma
Discovery Information
- First Discovery
- 1908
- Described by
- Barnum Brown
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Ornithischia
- Family
- Ankylosauridae
- Genus
- Ankylosaurus
- Species
- A. magniventris
Data status
Taxonomic name matched to PBDB and checked on 2026-08-08.
Taxonomic linkage does not automatically validate size, mass, behaviour or appearance.
- Type specimen
- AMNH 5895
- Type locality
- Hell Creek Formation, Montana, USA